There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
Other popular foods in Zimbabwe include peanuts, cucumbers, butternut squash, beans, gem squash and corn. Bowara, pumpkin leaves, are commonly used in stews, but can also be eaten fresh. Bowara is commonly used in dovi, which is a peanut butter stew.